Addison flirts with a colleague at St. Ambrose Hospital; Sheldon and Pete try to convince Violet to take a paternity test; Sam accidentally calls Sonya by the wrong name.

Owen puts the residents through a rigorous trauma certification drill; Cristina is left alone to monitor an ill lung transplant patient.

Sam, Dean, Bobby and Castiel track Eve to a small town in Oregon. The guys discover the townspeople have been converted to demons, but surprisingly, they all appear to be…

Sam and Dean encounter a vampire hunter whose obsession may get them all killed.